Merfolk are people with the upper half of a human and the lower half of a fish. Some of them keep their tails and others get legs when they are on land. If Merfolk do have their legs on land; they tend to be weak runners, and might trip more so than humans. Along with these traits, merfolk tend to have a connection with marine life such as fish, frogs, or other animals.
Some merfolk are able to manipulate water if they are powerful enough.